Metallurgy and Foundry Engineering
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ISSN 1230-2325
e-ISSN: 2300-8377
Issue Date
2016
Volume
Vol. 42
Number
No. 1
Description
Journal Volume
Metallurgy and Foundry Engineering
Vol. 42 (2016)
Projects
Pages
Articles
Comparative assessment of Al-Si alloy gassing degree with the application of the 'first bubble' and 'solidification under decreased pressure' methods
(2016) Zych, Jerzy; Piękoś, Marcin; Kolczyk, Joanna
All aluminum alloys in a liquid state are characterised by easy oxidation and absorption of hydrogen from the surroundings (which are the main reasons for casting defects). The amount of hydrogen adsorbed by a liquid alloy depends mainly on temperature and melting time. The performed investigations were aimed at comparing two known methods of measuring a metal gassing degree, the first bubble method and sample solidification under decreased pressure. Liquid metal melting and holding processes were performed under different conditions that caused variability of its gassing degree, resulting in a variability of purity and quality of the liquid metal. The investigations were carried out with using the hypoeutectic aluminum-silica AK7 alloy.
An introduction to the problem of the conversion of structural components, including components manufactured by casting techniques
(2016) Czekaj, Edward; Pysz, Stanisław; Garbacz-Klempka, Aldona; Żuczek, Robert
Modern development of technology features not only dynamic changes aimed at improving the performance characteristics of structural components through the optimum selection of materials, adjustments in design, or upgrade of manufacturing processes, but also the increase of the economic impact resulting from these changes. All of these processes occur under one common name of conversion and have a simple or – more often complex character (due to the vast scope of changes introduced). This article examines some basic definitions related to the concept of conversion and its association with innovative and intelligent solutions currently applied in materials engineering. Due to a variety of problems, attention was focused on the core notions related to conversion. Basing on our own experience (i.e., on the experience of the Foundry Research Institute and AGH University of Science and Technology in Krakow) and also on foreign achievements in this particular field of knowledge (mainly coming from the US), the most interesting examples of the conversion of materials and design (in the authors’ opinion) were discussed with reference to the methods of manufacture and possible interactions.
Research into oxide inclusions in silicon bronze CuSi3Zn3MnFe with the use of X-ray microanalysis
(2016) Romankiewicz, Remigiusz; Romankiewicz, Ferdynand
This paper presents the results of X-ray microanalysis oxide inclusions in silicon bronze in terms of selection microadditions deoxidizers-modifying. On the basis of the oxides present in the alloy, it was found that the most appropriate microadditive is zirconium.
Development of strength and electrical properties of Al-Si-Mg casting aluminum alloys with an Mg content of 1 wt%
(2016) Knych, Tadeusz Antoni; Wiecheć, Justyna; Uliasz, Piotr
Silumins (i.e., alloys where the main alloy additive is silicon) are the largest casting aluminum alloy group. Materials of this kind are characterized by high strength properties, high corrosion resistance, and low density, which make it possible to use them for construction purposes. A new group of developed properties typical for casting silumins are electrical and thermal conductivity. Thermal and electrical conductivity can be optimized by the suitable selection of chemical composition of the alloy, in the process of precipitation hardening, or by means of a combination of both. The present paper includes test results of the strength and electrical properties of AlSiMg casting aluminum alloys. The alloys that were subject to testing were AlSi5Mg1, AlSi7Mg1, and AlSi11Mg1. Heat treatment included homogenization at a temperature of 535°C over a time period of 8 h, quenched, and artificial aging. The strength tests involved a Brinell hardness measurement as well as an electrical properties test involving electrical conductivity measurement tests.
Al 6082 and Al 7075 alloys under the modified low-cycle fatigue test
(2016) Maj, Maria; Piekło, Jarosław
This paper discusses the possibility of assessing the quality of materials in terms of their mechanical properties as determined by a modified low-cycle fatigue test applied in these studies. The developed computer program adapted to the needs of an MTS universal testing machine is described, as are the details of an algorithm used by this program. The compatibility of test results obtained by the two methods (i.e., the standard low-cycle fatigue test [LCF] and its modified original version [MLCF]) has been demonstrated on the samples of selected non-ferrous metals alloys.